Grinding mill



Jan. 17, 1928. i 1,656,503

J. B. C. SCHERBAUM GRINDING MILL Filed Feb. 11. 1927 ,Fiyi

- Patented 1311.17, ms.

drawing, may have a lrings 1 or cillating about UNITED STATES 1,656,503 PATENT OFFICE.

JOHANN :BERNHARD CHRISTIAN SCHERBAUM, OF

WEDEL, HOLSTEIN, GERMANY.

GRINDING .MILL

Application nled February 1,1, 1927, Serial No. 167,534, and in Germany February 15, 1926.

mill of the type in which Within .a grinding ring or mantle one or more round bodies roll and which of this kind inasmuch or immovable grinding ring adapted to oscillate transversally to the axis either in a straight or curved path at such a strokev and in such frequency that the rolling bodies (balls) are set toroll. As has been proved by experiments by the aid of such a mill, which in other respects is distinguished by unusual constructive simplicity, nearly all kinds of material, whether they are soft or hard can be disintegrated not only `to a coarse but also toa very ne powder.- The surface pressure of the rolling bodies, which vsolely roll under the action ofthe centrifugal force, may be extraordi narily increased, and nevertheless the power required to operate the mill is very small. By thedrawing several modes of construction of a'mill of this' kind are shown.

Fig. l is a front elevation of the mill partly in section, and

' Fig. 2,is a side elevation also section'.

Figs. 3 and 4 are diagrammatical viewsI of modified grinding rings.

In the example shown the mill is provided with three grinding rings 1, which are partly y in adapted to oscillate about a common axis arranged on top as may be gathered from Fig, 3 so that the rings are suspended therefrom. The same, the principle of the invention will not be altered by arran 'ng the grinding rings 1 in a horizontal p ane or, no matter in which .position they'are applied, the may be connected with one an other to orm a common drum-like mantle. Within the grindin rings l are placed the rolling bodies 4, w shown are represented by balls. These balls or rolling bodies, as is shown in the diameter, which is larger than the radius of the inner face of the grinding rings or drum-like rinding mantle, however, they may as well ave the same diameter, or may be smaller than ,the

radius of the said inner surface.

' According to the invention the rolling bodies (balls) are set to roll by the grinding theA common grinding mantle os-V the axis 2, which oscillations differs from the known mills Vas the generally fixed' or mantle is ich 1n the construction `may be effected by way of example by the,

aid of a pitman 5 engaging one of the rings or the common mantle yat a distance from the oscillatory shaft or axis 2, the pitman being operated or set to oscillate or reciprocated by the aid of any convenient means, for instance by an eccentric drive operated electrically, orthe like. Instead of compelling the grinding rings or the common grinding mantle to oscillate in a curve they may be given a straight-line reciprocating movement; Even in such case the rolling bodies willvbe set to rotate or roll in the manner desired. Preferably every grinding rino* has a spherical inner circumferential surface 6, which thus forms a rolling path for the balls 4. Each grinding ring may also have two or more rolling .paths 6 according to the size of the balls 4; used. A common 'grinding mantle will also be providedpreferably with such rolling paths.

. In the example shown the grinding rings -1 are arran ed at a distance from one another and t e intermediate spaces are filled up by filling pieces 7 through which the shaft or axis 2 passes, and which are given such a shape as to form guide faces 8. These ide faces form a continuation ofthe rolling paths 6, and have the result, that inthe starting and balls 6 are guided within the rings 1.

The diameter of the balls may, as shown in the drawing, surpass the breadth of the rolling rings 1, however this is n'ot an absolute necessity. The upper parts of the fillinfr pieces 7 are expanded funnel-like at 9 ig. 2), and merge 'into a 'casing 10 which is preferably closed on top, 4communicating with all inner spaces of .the rinding rings 1 and the filling pieces 7 which by the outer walls 7a are connected with one another to form a closed chamber. By the -feeding openings or' pipes 11 the material to be ground will be allowed to enter the casing 10. From these orifices the material falls down over the baiiie plates 12 on both sides of the Grinding rings 1 and is guided by the guide faces 8 into the rolling paths 6. The

comminuted or ground material is led away in the stopping of the mill the preferably by the aid of suction pipes 13, 1n which a vacum is created while air is allowed to enter b air ports 14 into the lling pieces 7 an the walls 7".V The air thus enterin these' ipe is saturated within the mill wit the e, powdered ding material and then drawn away by e pipes 13 I claim 1. A` rindinvrmill comprising a grindin ring@ reel roun body with-insha grin ring being mounted to oscil ate transversa to its axis to such an extent and with suoliT fre uency that the 'rolling bodies 'are compell to roll, and means for oscillatin said rin 2. A grinding' l com rism a plurality of grinding rings mount at a tance fromone another, a freely rolling body within mg r1n the grin each ring respectively, filling pieces between of the A mount of i rings are firmly connected for oscillatory the grinding rings, guide surfaces on said pieces merging into the inner surface grinding rin s the material into t e inner space of the grindn ring, the

for oscillatory movement, whereby the rolling bodies are actuated therein.

3. A ding mill comprisin a plurality of grinnimg rings mounted at a istance from one another, a freely rolling body within each ring respectively, filling pieces between the grinding rings, guidesurfaces on said pieces merging into the inner surface of the grinding rlnvs and adapted to lead the material into t grinding ring, the piecescommunicating with the inner vspaces of the grin rings to form a common chamber, the gnndingrings being mounted movement, whereby the rollactuated therein, a -casing on chamber also communicatin therewith and provided with feeding an outlet orifices` 4. A grinding mill accordingl to claim 1, characterized by this that the grinding ring is set to oscillate ,about hn axis at a distance from the centre line of the ring.'

In testimony whereof I have signed my name to this specication.

will IEINHAID CHRISTIAN SCHERIAUI.

ing bodies are the top of said and adapted to leadf grinding rings being e inner space of the inner spaces of the filling 

